Of course, real fans know that, far from being a jerk, Yuka is really an unsung hero of the piece, often more active in events than Kouta himself, while he remains near the center of things.
But her reputation is that of a slap-happy brittle tsundere, a fact not helped by the anime. So who do you nominate as your tsundere against whom even a Yuka-hater would have to concede?
I nominate a non-manga/anime example. Back before Marvel semi-retconned Bobby 'Iceman' Drake to be gay, he had a girlfriend named Opal Tanaka. Now at first, she was a plucky girl reporter, and awestruck by her superhero guy. Then, they inexplicably made her the hidden daughter of a Yakuza Lord, sent to the USA to hide her, and now sought to fulfill old vows, not only engaging in samurai and yakuza stereotypes but copying off the much better Mariko Yashida storyline in Wolverine. At the end of this, one of the cybernetic samurai who had kidnapped Opal to start with sacrificed himself for her, and when Bobby arrived, Opal accused him of not even knowing what honor was, this to a guy who fought for a dream of racial peace for a world that hated and feared him. Every appearance after that, he would be saving her life from some menace that was attacking X-Men's friends and allies, and she would spew invective immediately. Finally, the last I heard of her, she deceived Bobby in a scheme to make him believe he had fathered her child as a means for some group or other to capture him. There may have been more, but I stopped reading comics because of stories like this.
My guess is, either she was altered for being too similar to Wally West's girlfriend and later wife, LInda Park, or that honor comment was meant to just show her in a low moment, and the next writer thought this was who she was and ran with it till we got this open betrayal storyline, which ended with 'maybe she really does love him after all' -- yeah.
I know that no one 'turns' against their sexual preference because of a bad relationship. But if this were possible, I'm convinced Opal Tanaka could pull it off. I hope she died when the MU blew up, and as iffy as I am on Bobby suddenly having been 'always' gay, if we never see Opal again, I withdraw my concerns.
Sorry for the spelling error.